Designed and developed by the best American and German engineers, all ProSport rifle scopes are manufactured in an American owned and managed factory dedicated to building rifle scopes exclusively for Simmons. Addressing every major aspect of design and performance, Simmons has truly reinvented the riflescope, providing features that obsolete all rifle scopes built today, Featuring Simmons' patented True Zero adjustment system and QTA eyepiece with up to 5.5 inches of eye relief.